shell:$ nslookup -timeout=2 -retry=1 'mtncloud-my.sharepoint.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
mtncloud-my.sharepoint.com	canonical name = mtncloud.sharepoint.com.
mtncloud.sharepoint.com	canonical name = 1736-ipv4v6s.clump.dprodmgd104.aa-rt.sharepoint.com.
1736-ipv4v6s.clump.dprodmgd104.aa-rt.sharepoint.com	canonical name = 188023-ipv4v6s.farm.dprodmgd104.aa-rt.sharepoint.com.
188023-ipv4v6s.farm.dprodmgd104.aa-rt.sharepoint.com	canonical name = 188023-ipv4v6g.farm.dprodmgd104.sharepointonline.com.akadns.net.
188023-ipv4v6g.farm.dprodmgd104.sharepointonline.com.akadns.net	canonical name = 188023-ipv4v6.farm.dprodmgd104.aa-rt.sharepoint.com.dual-spo-0005.spo-msedge.net.
188023-ipv4v6.farm.dprodmgd104.aa-rt.sharepoint.com.dual-spo-0005.spo-msedge.net	canonical name = dual-spo-0005.spo-msedge.net.
Name:	dual-spo-0005.spo-msedge.net
Address: 13.107.138.10
Name:	dual-spo-0005.spo-msedge.net
Address: 13.107.136.10
Name:	dual-spo-0005.spo-msedge.net
Address: 2620:1ec:8fa::10
Name:	dual-spo-0005.spo-msedge.net
Address: 2620:1ec:8f8::10